GAMMADIM (găm'a-dĭm, Heb. gammādhîm). Found only in Ezek.27.11 (kjv), the word is open to different interpretations. “Men of Gammad” (so niv) were said to be in the towers of Tyre. ASV reads “valorous men,” perhaps on the basis that foreigners would hardly be trusted to watch in those towers.
International Standard Bible Encyclopedia (1915)
The word occurs only in Eze 27:11, in the in form "Gammadims," in the English "Gammadim." In the American Standard Revised Version, as also in the English Revised Version, margin, it is rendered "valorous men." Some think a proper name is required, but identification is not possible, and the meaning remains doubtful.